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西部绿旗 11-9 联合空地攻击演习中，美国空军第171空中加油中队（171ARS）一架 KC-135R 加油机在欧文堡国家训练中心空域提供油料支持。（U.S. Air Force Capt. Deryck Castonguay and Capt. Matt Hendrickson, 171st Air Refueling Squadron pilots, Selfridge Air National Guard, Mich., fly a KC-135 Stratotranker during Green Flag-West 11-9 Aug. 16, 2011, over the National Training Center at Fort Irwin, Calif. Green Flag-West provides a realistic close-air support training environment for forces preparing to support worldwide combat operations.）